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Operating income (Details) - ARS ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating income from services and other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues and other income |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,104 | $ 45,437 | $ 34,524
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (39,279) | (32,711) | (25,079)
Operating income before depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 17,825 | 12,726 | 9,445
D&A |  |  |  |  |  |  |  |  |  |  |  |  | (6,928) | (6,198) | (4,438)
Disposals and impairment of PP&E |  |  |  |  |  |  |  |  |  |  |  |  | (316) | (383) | (199)
Operating income from services and other income |  |  |  |  |  |  |  |  |  |  |  |  | 10,581 | 6,145 | 4,808
Operating income (loss) from equipment sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from sale of telecommunication equipment |  |  |  |  |  |  |  |  |  |  |  |  | 8,215 | 7,886 | 6,016
Cost of equipments and handsets |  |  |  |  |  |  |  |  |  |  |  |  | (6,684) | (6,188) | (4,595)
Total income for sale of equipment and handsets |  |  |  |  |  |  |  |  |  |  |  |  | 1,531 | 1,698 | 1,421
Operating income | $ 3,094 | $ 3,167 | $ 2,958 | $ 2,893 | $ 2,320 | $ 1,802 | $ 1,724 | $ 1,997 | $ 1,770 | $ 1,311 | $ 1,468 | $ 1,680 | 12,112 | 7,843 | 6,229
Consolidated net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income before depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 19,356 | 14,424 | 10,866
D&A |  |  |  |  |  |  |  |  |  |  |  |  | (6,928) | (6,198) | (4,438)
Disposals and impairment of PP&E |  |  |  |  |  |  |  |  |  |  |  |  | (316) | (383) | (199)
Operating income | $ 3,094 | $ 3,167 | $ 2,958 | $ 2,893 | $ 2,320 | $ 1,802 | $ 1,724 | $ 1,997 | $ 1,770 | $ 1,311 | $ 1,468 | $ 1,680 | $ 12,112 | $ 7,843 | $ 6,229

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